<template>
  <div class="spec-preview">
    <img ref="img1"  :src="mobile_parameters.skuDefaultImg" />
    <div class="event" @mousemove="move"></div>
    <div class="big">
      <img 
      ref="img2"
      :src="mobile_parameters.skuDefaultImg"
      :style="{left:-2*left+'px',top:-2*top+'px'}"
      />
    </div>
    <div class="mask" ref="mask" :style="{ left: left + 'px', top: top +'px'}"></div>
  </div>
</template>

<script>
import { mapGetters } from 'vuex'
  export default {
  name: "Zoom",
   data() {
    return {
      left: 0,
      top: 0
    }
  },
  //计算属性
  computed: {
    ...mapGetters('Detail', ['mobile_parameters']),

   
  },
  methods: {
       //放大镜效果
      move(e) {
      let x = e.offsetX - this.$refs.mask.clientWidth / 2
      if (x < 0) x = 0
      if (x > 200) x = 200
      let y = e.offsetY - 100
         if (y < 0) x = 0
      if (y > 200) x = 200

      this.left = x
      this.top=y
      }
  }
  }
</script>

<style lang="less">
  .spec-preview {
    position: relative;
    width: 400px;
    height: 400px;
    border: 1px solid #ccc;

    img {
      width: 100%;
      height: 100%;
    }

    .event {
      width: 100%;
      height: 100%;
      position: absolute;
      top: 0;
      left: 0;
      z-index: 998;
    }

    .mask {
      width: 50%;
      height: 50%;
      background-color: rgba(0, 255, 0, 0.3);
      position: absolute;
      left: 0;
      top: 0;
      display: none;
    }

    .big {
      width: 100%;
      height: 100%;
      position: absolute;
      top: -1px;
      left: 100%;
      border: 1px solid #aaa;
      overflow: hidden;
      z-index: 998;
      display: none;
      background: white;

      img {
        width: 200%;
        max-width: 200%;
        height: 200%;
        position: absolute;
        left: 0;
        top: 0;
      }
    }

    .event:hover~.mask,
    .event:hover~.big {
      display: block;
    }
  }
</style>